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Title: Structural, mutagenic and in silico studies of xyloglucan fucosylation in Arabidopsis thaliana suggest a water-mediated mechanism

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.13628· OSTI ID:1389734

Summary The mechanistic underpinnings of the complex process of plant polysaccharide biosynthesis are poorly understood, largely because of the resistance of glycosyltransferase (GT) enzymes to structural characterization. In Arabidopsis thaliana, a glycosyl transferase family 37 (GT37) fucosyltransferase 1 ( At FUT1) catalyzes the regiospecific transfer of terminal 1,2‐fucosyl residues to xyloglucan side chains – a key step in the biosynthesis of fucosylated sidechains of galactoxyloglucan. We unravel the mechanistic basis for fucosylation by At FUT1 with a multipronged approach involving protein expression, X‐ray crystallography, mutagenesis experiments and molecular simulations. Mammalian cell culture expressions enable the sufficient production of the enzyme for X‐ray crystallography, which reveals the structural architecture of At FUT1 in complex with bound donor and acceptor substrate analogs. The lack of an appropriately positioned active site residue as a catalytic base leads us to propose an atypical water‐mediated fucosylation mechanism facilitated by an H‐bonded network, which is corroborated by mutagenesis experiments as well as detailed atomistic simulations.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1389734
Alternate ID(s):
OSTI ID: 1377643
Report Number(s):
NREL/JA-2700-67766
Journal Information:
The Plant Journal, Vol. 91, Issue 6; ISSN 0960-7412
Publisher:
Society for Experimental BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (8)

3D Structure and Function of Glycosyltransferases Involved in N-glycan Maturation journal January 2020
Emerging structural insights into glycosyltransferase-mediated synthesis of glycans journal August 2019
Arabidopsis thaliana α1,2‐ l ‐fucosyltransferase catalyzes the transfer of l ‐galactose to xyloglucan oligosaccharides journal December 2018
Analytical Techniques for Determining the Role of Domain of Unknown Function 579 Proteins in the Synthesis of O -Methylated Plant Polysaccharides journal March 2020
Critical Review of Plant Cell Wall Matrix Polysaccharide Glycosyltransferase Activities Verified by Heterologous Protein Expression journal July 2019
Plant Fucosyltransferases and the Emerging Biological Importance of Fucosylated Plant Structures journal July 2019
Expression system for structural and functional studies of human glycosylation enzymes journal December 2017
Analyzing Xyloglucan Endotransglycosylases by Incorporating Synthetic Oligosaccharides into Plant Cell Walls journal February 2018

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